Type-writing machine.



w. E. BARNARD. TYPE WRITING MACHINE: unrulynon FILED um. 17? 19105 lnvcvd m.

Patented Sept. 16,1913.

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WALTER E. BARNARD, OF HARTFORD, CONNECTICUT, ASSIGNOR TO UNDERVJ'QOD:

TYPEWRITER COMPANY, OF NEW YORK, N. Yl, A CORPORATION OF DELAWARE."

TYPE-WRITING'MACHINE.

Specification of Letters Patent. Patented Slept 16 1913. Application filed September 17, 1910. Serial No. 582,443.

To all whom it may concern Be it known that I, lVAL'rnn E. BARNARD,

a: citizen of the United States, residing in Hartford, in the county of Hartford and Nriting Machines, of

State of Connecticut, have invented-certain new and useful Improvements in Typewhich the following is a specification.

This invention relates to line-space mechanisms, and one object, thereof is to provide improved and-simplified means to arrest the platen at the end of the line-space stroke. I provide a lever, one arm of which is struck preferably by the line-spacing pawl to cause the opposite arm of the lever to press the usual detent forcibly against the line-space wheel, to arrest the latter and the platen.

Another feature of the invention is to restore automatically the control of the spring detent over the platen, after said detent has-been locked away. from the linespace wheel. This is preferably also done by the line-spacing pawl. Preferably a-single arm engaged by the line-spacing pawl both restores the detent, (if it be in abnor mal position), and finally forces said detent into a notch of the line-space wheel.

In the accompanying drawings,'Figure l is a side view, showing one form of the invention applied to the platen frame otan Underwood writing machine, the detent being cast oil. Fig. 2 is a detail perspective of the combined detent-releasing and platen-arresting lever. Fig. 3 shows the line-spacing pawl arrested by the stop arm, the detent having been returned to operative position. Fig. 4: is an enlarged detail, showing the le ver between its extremev positions. Fig. 5 is a detail perspective of the line-spacing pawl. Fig. 6 is like Fig. 4, but showing the platen arrested at the completion of the linespacing action. I

I Types 1 strike a platen 1, mounted on an axle 2, jourhaled in the ends 3 of a platen frame. A lfiver 4 drives a slide 5, carrying a pawl 6 ha ing a tooth'portion 7 to engage a notched wheel or ratchet 8 fixed on the axle 2. Thelever, slide and-pawl constitute means to drive the wheel, the slide and pawl.

forming a driving device movable into direct driving engagement with the wheel. -A spri'ng detent 9, pivoted, at 10, engages the i wheel, said detent having a roll .11 to seat notches of said wheel to hold in any offthe I A shoulder 13 on the pawl the platen.

away handle 21 for this purpose.

strikes one arm 14 of a lever, (having a hub 15 supported loosely on the hub 16 of the wheel 8) the opposite arm ,17 of the lever being hooked to catch over a pin 18 usually provided on the detent 9, (Fig. 4), and

torce the detent into a notch of the wheel 8. For this purpose, one edge of the hook may form a cam 19, which presses the detent roll 11 forcibly into the notch. This action of the detent occurs at the moment when the wheel 8 has been turned by the pawl, 7 to bring one'of its notches in register with the detent roll. By this means overthrow of the platen is prevented; the continuedpressure on the lever 4: tending to force the detent or stop-roll 11 more powerfully into the notch.

The lever 14, 17, may be a modification of the usual detent-releasing lever, which commonly has on the outer end of arm 17, a cam 20 to engage the pin 18 to force the detent from the wheel, the lever having a- I A dwell por tion 22 on the cam 20 usually locksjthe detent away from the wheel. A stop 23 is usually provided on the lever. De ression of the handle 21 releases the pin 18 rom the cam, whereupon the control of the spring nation with aplaten ratchet, a pawl, and a deten't normally engaging the ratchet, of a cam to press .the .detent into a notch in the ratchet, and. an arm struck by the pawl t0 operatetl e cam. y

In a typewriting machine, the-confin nation with a platen and line-space meche nism therefor including a platen ratchetand a pawl, of a detent seating in a notch.

in the ratchet, andia member operatively engaging thewdetent and intermittently engaged by the pawl of the line-spacing mechanism to press the detent into its notch.

3. In a typewriting machine, the commnation with a platen ratchetwheel, of a detent to engage said ratchet wheel, a-lever pivotednpon the axis of the ratchet wheeland including an arm to press said 'detent into the notches of the wheel, and a pawl to drive said wheel for line-spacing, said lever also including an arm to be operated by said driving pawl.

4. In a typewriting machine, the combine, tion with a platen ratchet wheel and a spring pressed detent therefor, of a linespacing pawl to engage said ratchetvwheel,

alever hav'mgan'arm engaged by said pawl,

and another arm engaging said detent to force the sameinto'tlie notches of the ratchet wheel. p

5. In a typewriting machine, the combination with a line-spacing wheel, of a spring 'detent for the wheel, a device movable to release said detent and hold it-- released, a pawl for said line-spacing wheel, and'means to enable said pawl to return said releasing device.

6; In a typewriting machine, the combina- 'tion with a line-space ratchet wheel, a pawl,

and a-spring pressed detent engaging the wheel, of a lever to cast off the detent and hold it ineffective, said lever havin a part in the path of said pawl to enable the latter to return the lever to normal position, means on said lever to enable said pawl to press the detent into the notches of the wheel.

7 Ina typewriting machine, the c0mbinatlon with a line-space ratchet, of a detent and l '-with said ratchet, of means on the pawl to move said lever to engage said detent with said ratchet as it turns the ratchet in linespacing direction;

9. In a typewrltin'g machine, the combinationYof a platen having an axle, a linespacing ratchet,- a pawl therefor, a detent for said ratchet, and a lever pivotally mounted on the platen axle and having means to'release said detent, andengageable by said pawl to restore said detent.

10; In a typewriting machine, them'ombination with a line-space ratchet, of a detent normally held in engagement with the ratchet by springpressure, means to cast off the detent and hold it inefiective, and a linespacing pawl provided with means to restore said detent and apply a holding pressure thereto.

. WALTER E. BARNARD.

Witnmes:

Fen an A, Coon, W; M; DroRKMAn.

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